Improvement in casting hollow articles



llni'td glatte J. BRUNNER, OF NEW'YORK, N. Y,

Lenen Patent No. 95,645, 1a-tec October 12,1869.

IMPROVEMENT IN CASTING- HOLLOW ARTICLES.

The Schedule referred to-in these Letters Patent and making part of the same.

To all whom it may concern:

Be it known that I, J. BRUNNER, of thecity, county, and State of New York, have invented a new and useful Improvement 'iu GastingHollow Articles; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enableothers skilled in the'art to make and use the same, reference being had to the accompanying drawings, forming part of this specification. v

This invention relates to an improved mode of casting hollow articles, such as toys, commonly made of soft metal, and also made hollow for the purposes of lightness and economizing metal.

The invention consistsv in forming the hollow castings by the employment of chill moulds made in two parts, with large openings from the exterior tothe moulds at one side, and smaller air-escaping passages from the opposite sides, which moulds are plunged into the molten metal from .which the castings are to be made, with the said large openingsdownward, and the smaller ones upward, so that the metal will flow in freely tothe moulds, and become chilled against the surface of the moulds, and solidified suiiciently to form the exterior shell of the article required. The

a-sk or mould is then' raised vertically out of the molten metal, to allow the central part not solidified to flow out, leaving the castings hollow. They are then removed from the moulds in the usual way.

Figure 1 represents a face view of one part of. a

, ask, such as I use, with the castings remaining in v the moulds thereof.

Figure 2 represents a transverse section of aliask when immersed in avessel containing molten metal.

Similar letters of reference indicate corresponding parts.

I make a metallic flask of two parts, A, having the moulds for the articles required made in them in the 'usual way, that is to say, made half in each part, but instead of laying thev said flaskupon the side and forming the metal into it in the usual way, I make large openings B, leading to the moulds or dies from one side, preferably leading to that part which forms the base of the article to be cast, and at the opposite side, IA make small air-escape passages, c, one or more,`as may be required by the shape of the mould, for allowing the escape of the air from the highest parts of the mould when suspended, as shown in iig. 2.

These flasks, so constructed, and provided with as many moulds as found most convenient, I use byimmersing in the molten metal F cntained in any suitable vessel, so as to permit the metal to flow into the moulds or dies from below, while the air escapes all the passages c above, holding the said flasks by tongs F, or other preferred means.

The flasks being cold, will, on the dies therein being vsuddenly filled with the fluid metal, chill the same to a certain extent, according to the timeit remains in the melted metal, forming a thin shell over thewhole of the faces of the moulds. After holding the said flasks in the metal a sucient length of time, as above, I draw them out vertically, leaving vthe metal not chilled or solidified to flow out from the central parts of the castings, whereby they are made hollow and light as required.

The flasks are then opened, and the castings removed 'and trimmed off as required.

I am aware that hollow castings have lbeen made by the use of chill asks, the mode of operation being to hold the flasks with the openings B upward, and

filling them in that position, turning them over and pouring the metal -out after the shells are formed by soliditioation, but this inode is objectionable, for the reason that only one casting can be well made at the time, for owing to the diiiiculty of pouring with regularity, and the shoit time required to chill and solidify' the shell, the castings cannot be made uniform; moreover, the labor is much greater than by my improvedv mode.

Having thus described my invention, I claim as new, and desire to secure by Letters' Fat-4 ent l Making hollow castings by inserting in molten metal a chill mould, A, having an air-passage or passages,

' c, in its upper side, and passage or passages B in its lower side, and then withdrawing the same when the shell is formed, tol allow the central or unchilled por tion of the metal to escape, substantially as herein set forth.

J. BRUNN ER.

` Witnesses:

GUs'rAvn Brummen, Gao. W. MABEE. 

